Brake drum



T. M. ROSEBERIRY BRAKELLDRUM Filed March 1, 1932 2 Sheets-Sheet 1 lNVENTOR y 1935- T. M. ROSEBERRY BRAKE DRUM Filed March 1, 1932 2 Sheets-Sheet 2 arm -9 INVENTOR 9 J0 fiy 44M,

flMI 1% Patented July 16, 1935 OFFICEIT BRAKE DRUM Thayer M. Rose-berry, Wheeling, W. Va.,.assignor to Wheeling'Steel Corporation, Wheeling, W.

Va., a corporation .of Delaware Application March l, 1932, Serial No. 596,000

6 Claims. (01.188- -218) This invention relates generally to brake drums, and more particularly to brake drums consisting of a shell made of one metal, such as steel, and a liner of another metal, such'as cast iron. l

I In the accompanying drawings, which illustrate the present preferred embodiment of my invention,

Figure 1 is a plan view 'of a brake drum, a portion being broken away to illustrate the interior construction;

Figure 2 is a section on the line 11-11 of Figure 1; a I

Figure 3 is a partial plan view of a base member which is connected to the wheel, the'd'base member forming part of a shell for a liner;

Figure 4 is a partial plan view-of a liner adapted to fit within the shell; I

Figure 5 is a partial plan view of a retaining member which acts to retain the liner within the'shell; i I

Figure 6 is a side elevation of theparts shown in Figures 3, 4 and 5, the parts being shown in their relative positions just before assembly, and

Figure '7 is a partial side elevation of the assembled brake drum.

Referring more particularly to the accompany ing drawings, the brake drum comprises a liner 2, a base member3 and a retaining member or ring 4, the base member and retaining member when assembled forming a shell for theliner. The base member 3 and the retaining member. 4 are made out of steel in the preferred, embodiment, and the liner is of cast iron.

The base member 3 has an annular portion 5 which resists the pressure of the brake, and a base 6 which is provided with holes I for securing the base member to a wheel. The edge of the base member 3 opposite the base 6 is formed in an outwardly extending flange 8 which bears against one side of a flange 9 formed on the liner. Spaced along the periphery of the flange 8 are projections I0 which fit into corresponding recesses I I formed in the outer edge of the flange 9 of the liner. V

At the side adjacent the base member 3, the retaining ring 4 is bent to form a flange I5 which fits against a side of the flange 9 of the liner. The flange I5 is provided along its periphery with 50 lugs I6 which also fit into the recesses II formed in the outer edge of the flange 9. It will be seen from Figure 7 that when the parts are assembled, the projections I0 and I6 extend into the recesses II so as to contact with each other. The base member and the retaining ring are secured to each other by welding indicated by the reference numeral I'I. I

At the side opposite the base member 3, the retaining ring 4 is bent in a return bend to form a flange I8 which fits over the edge of the liner 5 which is opposite thebase inembe I It will be seen from the description thusfar given that the brake drum consists essentially of the base member 3, the retaining ring-t, which together form a shell, and a liner 2 of cast iron or 10 other suitable material. The liner is retained within the shell by contact between the flange 9 and the flange I5 of the retaining ring. The liner also is retained in position by the return bend flange I8 on the retaining ring. The base mem- 15 ber 3 and the retaining ring 4 are welded or otherwise secured so as to form, in effect, a-unitary member after the parts are assembled, but the fact that the shell is composed of apluraIityof parts allows the use of a liner having'an outwardly extending flange, such as-the flange 9, for maintaining the liner in place within the shell. The liner is prevented from rotating relative to the shell because of the recesses I I formed in the liner which receive the lugs I0 and I6 formed on the base member and retaining ring, respectively.

Brake drums become heated when the brake is applied and cooled when the brake is released. This causes contraction and expansion of the drum which tends to warp the drum and tends togive uneven bearing surfaces for the brake. In the present invention, the strains ordinarily set up by contraction and expansion of the drum are compensated by providing the base member with an expansion bend 20. This bend is disposed annularly of the base portion 6 and forms a somewhat resilient member which allows the annular portion of the shell, against which the brake exerts its pressure, to expand and contract without setting up excess strains in the drum.

In assembling the drum, the liner is inserted within the base member 3, the parts being in such position that the projections I0 on the base member fit into the recesses II in the annular flange of the liner. The retaining ring 4 is then placed over the liner and assembled so that its projections I6 extend into the recesses II and the return bend flange I8 fits over the exposed edge of the liner. The parts will then be in the position indicated in Figure 7 and the base member and retaining ring are then secured to each other by welding or other suitable means.

The parts may be made by stamping, forging or other suitable operation, but in the preferred method the retaining ring 4 and that part of the base member 3 lying outside of the circumferential line 25 are made as a unit by a rolling operation, and the unit is then split to form the retaining ring and base member. In other words, the retaining ring A and base member 3 would be formed as a unit, the projections 46 and I0 illustrated in Figure 6 at that time being joined, each of the projections I6 and I0 forming a single web connecting the retaining ring and base member together. The parts are then severed along the line 26 to form the projections ID and H5. The unit, which is eventually split to form the retaining ring 4 and base member 3, is rolled and thereafter, either before or after splitting the unit so as to form the separate retaining ring and base member, the flat plate-like portion 6 of the base member is welded to the remaining annular portion of the base member along the line 25. It will thus be seen that in the preferred method of forming the elements which go to make up the brake drum, the retaining ring 4 and base member 3 are rolled as a unit and are thereafter split to form the two elements. Also, that at the time of rolling, the flat base 6 is absent and that this base is welded along the line 25 to the remainder of the base member 3 either before or after the parts are split to form the two elements.

The invention provides a simple means for looking a separately formed liner which may be of cast iron into a shell which may be of steel. The liner is locked in such a manner that it is retained within the shell, and relative rotation between the liner and shell is prevented also.

I have illustrated and described the present preferred embodiment of my invention. It is to be understood, however, that the invention may be otherwise embodied or practiced within the scope of the following claims.

I claim:

1. A brake drum, comprising a shell consisting of a plurality of parts, a liner inside of the shell, a flange on the outside of the liner fitting between the parts of the shell, the parts of the shell having interfltting projection and recess engagement with the flange of the liner for preventing relative rotation of the liner and shell, and means for securing the parts of the shell to each other.

2. A brake drum, comprising a base member adapted to be secured to a wheel, a retaining member, the base member and retaining member forming a shell for a liner, a liner inside the shell, a flange on the outside of the liner fitting between the base member and retaining member, and means for securing the base member and retaining member to each other. said base member and retaining member having interfltting projection and recess engagement with the flange of the liner to prevent relative rotation between the parts.

3. A brake drum, comprising a base member adapted to be secured to a wheel, a retaining ring, the base member and retaining ring forming a shell for a liner, a liner inside the shell, an annular flange on the outside of the liner fitting between the base member and retaining ring, pro-- jections on the base member and retaining ring fitting in recesses formed in the flange of the liner, and means for securing the base member and retaining ring together.

4. A brake drum, comprising a base member adapted to be secured to a wheel, a retaining ring, the base member and retaining ring forming a shell for a liner, a liner inside the shell, an annular flange on the outside of the liner fitting between the base member and retaining ring, projections on the base member and retaining ring fitting in recesses formed in the flange of the liner, and means for securing the base member and retaining ring together, said retaining ring having a flange fitting over the edge of the liner which is opposite the base member.

5. A brake drum, comprising a base member, a retaining ring, the base member and retaining ring forming a shell for a liner, a liner inside the shell, an annular flange on the outside of the liner fitting between the base member and retaining ring, projections on the base member and retaining ring fitting in recesses formed in the flange of the liner, means for securing the base member and retaining ring together, said base member having an annular portion resisting the pressure of the brake and a base portion adapted to be secured to a wheel, said base portion having an expansion bend formed therein.

6. A brake drum, comprising a base member adapted to be secured to a wheel, a retaining memher, the base member and retaining member forming a shell for a liner, a cast iron liner inside the shell, a flange on the outside of the liner fitting between the base member and retaining member, and means for securing the base mem her and retaining member to each other, said base member and retaining member having interfltting projection and recess engagement with the flange of the liner to prevent relative rotation between the parts.

THAYER M. ROSEBERRY. 

